data = []

with open('data', 'r') as fp:
    # NOTE(dev): We assume all lines are the same length
    for line in fp:
        data_line = []
        for ch in line.strip():
            data_line.append(int(ch))
        data.append(data_line)

total = 0
for y in range(0, len(data)):
    for x in range(0, len(data[y])):
        sub_total = 0
        all_four = 0
        # above
        if(y > 0):
            if(data[y-1][x] > data[y][x]):
                all_four += 1
        else:
            all_four += 1 # skip
        # below
        if(y < len(data) - 1):
            if(data[y+1][x] > data[y][x]):
                all_four += 1
        else:
            all_four += 1 #skip
        # left
        if(x > 0):
            if(data[y][x-1] > data[y][x]):
                all_four += 1
        else:
            all_four += 1 #skip
        # right
        if(x < len(data[y]) - 1):
            if(data[y][x+1] > data[y][x]):
                all_four += 1
        else:
            all_four += 1 #skip

        if(all_four == 4):
            total += data[y][x] + 1

print(total)